Question

there are 345 students in a college who have taken a course in physics and mathematics, 175 have taken courses in physics and mathematics. find the number of students who have taken a course either in physics or in mathematics​

Answer 1

Answer:

P(n) = P(A) + P(B) - P(A and B)

345 = P(A) + P(B) - 175

P(A) + P(B) = 520